Category setting 'Replace the new topic composer in this category' not working

Support Discourse Custom Wizard
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1

Environment

Discourse Version: v3.5.0.beta3-dev

Plugin Commit: d2ff1b5

Steps to Reproduce

Set the custom setting on a category

Custom Wizard

Select a wizard to replace the new topic composer in this category.

With a wizard. The + New Topic button won’t trigger the wizard.

Logs

When clicking the Save Category button. This is the log on the browser console.

ajax-error.js:9 Error: Assertion Failed: calling set on destroyed object: <(unknown):ember340>.wizardList = [object Object]
    at assert (assert.js:41:13)
    at set (property_set-BapAkp3X.js:39:48)
    at PluginConnector.set (observable.js:27:15)
    at custom-wizard-category-settings.js:11:1
    at invokeCallback (rsvp-DaQAFb0W.js:412:15)
    at publish (rsvp-DaQAFb0W.js:398:7)
    at invoke (index.js:264:14)
    at Queue.flush (index.js:180:11)
    at DeferredActionQueues.flush (index.js:334:19)
    at Backburner._end (index.js:762:32)
    at Backburner.end (index.js:565:10)
    at Backburner._run (index.js:806:14)
    at Backburner.run (index.js:600:17)
    at run (index.js:103:22)
    at args.success (ajax.js:133:10)